{"answers":{"affected":"1 open source package ship an affected version, including fast-xml-parser.","exploited":"There is no known exploitation of CVE-2026-126066 in the wild and no public exploit code.","exposure":"","fix":"Upgrade fast-xml-parser to 5.12.0 or later.","what":"CVE-2026-126066 is a low-severity vulnerability in NaturalIntelligence fast-xml-parser, published on 10 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-126066 and fix it if it is affected.\n\nWhat it is: CVE-2026-126066 is a low-severity vulnerability in NaturalIntelligence fast-xml-parser, published on 10 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-126066 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- fast-xml-parser (npm): affected all versions; fixed in 5.12.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-126066/ (Markdown: https://insights.sbomify.com/CVE-2026-126066/index.md)","id":"CVE-2026-126066","markdown":"https://insights.sbomify.com/CVE-2026-126066/index.md","name":"CVE-2026-126066","record":{"aliases":["GHSA-474x-hrwr-fgx4"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":3.7,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to 5.12.0, when the non-default stopNodes option is enabled, readStopNodeData() in OrderedObjParser.js calls readTagExp() for each less-than character in an unterminated stop-node body and repeatedly rescans the remaining input while looking for a closing greater-than character. An attacker who supplies XML containing many tag fragments without a later closing character can cause quadratic rescanning before parsing fails, blocking a Node.js event loop and causing CPU-exhaustion denial of service. This issue is fixed in version 5.12.0.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"fast-xml-parser: Quadratic CPU consumption scanning unterminated stop-node tags","id":"CVE-2026-126066","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":3,"next":{"headline":"Action Pack: Missing SameSite attribute on session cookies from Action Pack session stores","id":"CVE-2026-126067"},"nickname":null,"packages":[{"ecosystem":"npm","fixed":["5.12.0"],"introduced":["0"],"last_affected":[],"package":"fast-xml-parser","purl":null,"source":"GHSA-474x-hrwr-fgx4"}],"prev":{"headline":"OpenObserve: Empty external password allows authentication bypass","id":"CVE-2026-126065"},"products":["fast-xml-parser"],"published":"2026-11-10","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-11-12","vendors":["NaturalIntelligence"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-126066/"}